/*
Copyright 2020 The actions-runner-controller authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package actionsgithubcom

import (
	"context"
	"errors"
	"testing"
	"time"

	"github.com/actions/actions-runner-controller/apis/actions.github.com/v1alpha1"
	"github.com/go-logr/logr"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	corev1 "k8s.io/api/core/v1"
	kerrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	ctrlfake "sigs.k8s.io/controller-runtime/pkg/client/fake"
	"sigs.k8s.io/controller-runtime/pkg/client/interceptor"
)

func TestReconcileDefersRunnerIdentityUntilPodReportsStatus(t *testing.T) {
	ctx := context.Background()
	key := types.NamespacedName{Namespace: "default", Name: "test-runner"}

	scheme := runtime.NewScheme()
	require.NoError(t, corev1.AddToScheme(scheme))
	require.NoError(t, v1alpha1.AddToScheme(scheme))

	runner := &v1alpha1.EphemeralRunner{
		ObjectMeta: metav1.ObjectMeta{
			Name:       key.Name,
			Namespace:  key.Namespace,
			Finalizers: []string{ephemeralRunnerFinalizerName, ephemeralRunnerActionsFinalizerName},
		},
		Spec: v1alpha1.EphemeralRunnerSpec{
			PodTemplateSpec: corev1.PodTemplateSpec{
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{{Name: v1alpha1.EphemeralRunnerContainerName}},
				},
			},
		},
	}
	secret := &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{Name: key.Name, Namespace: key.Namespace},
		Data: map[string][]byte{
			jitTokenKey:  []byte("jit-token"),
			"runnerId":   []byte("7"),
			"runnerName": []byte("test-runner"),
		},
	}

	failStatusPatch := true
	statusPatchAttempts := 0
	c := ctrlfake.NewClientBuilder().
		WithScheme(scheme).
		WithObjects(runner, secret).
		WithStatusSubresource(&v1alpha1.EphemeralRunner{}, &corev1.Pod{}).
		WithInterceptorFuncs(interceptor.Funcs{
			SubResourcePatch: func(ctx context.Context, clt client.Client, subResourceName string, obj client.Object, patch client.Patch, opts ...client.SubResourcePatchOption) error {
				if _, ok := obj.(*v1alpha1.EphemeralRunner); ok {
					statusPatchAttempts++
					if failStatusPatch {
						failStatusPatch = false
						return errors.New("transient status patch failure")
					}
				}
				return clt.Status().Patch(ctx, obj, patch, opts...)
			},
		}).
		Build()

	newReconciler := func() *EphemeralRunnerReconciler {
		return &EphemeralRunnerReconciler{
			Client: c,
			Log:    logr.Discard(),
			Scheme: scheme,
			ResourceBuilder: ResourceBuilder{
				Scheme: scheme,
			},
		}
	}
	podCount := func() int {
		t.Helper()

		var pods corev1.PodList
		require.NoError(t, c.List(ctx, &pods, client.InNamespace(key.Namespace)))
		return len(pods.Items)
	}
	getRunner := func() *v1alpha1.EphemeralRunner {
		t.Helper()

		got := new(v1alpha1.EphemeralRunner)
		require.NoError(t, c.Get(ctx, key, got))
		return got
	}

	// The first pass creates the Pod but deliberately leaves status unwritten.
	_, err := newReconciler().Reconcile(ctx, ctrl.Request{NamespacedName: key})
	require.NoError(t, err)
	assert.Equal(t, 1, podCount())
	assert.Zero(t, getRunner().Status.RunnerID)
	assert.Empty(t, getRunner().Status.RunnerName)
	assert.Zero(t, statusPatchAttempts, "the runner identity must not delay Pod creation")

	// Identity remains deferred until the Pod reports a non-terminal container
	// status. A transient failure of that coalesced status patch returns an
	// error for reconciliation to retry without creating another Pod.
	pod := new(corev1.Pod)
	require.NoError(t, c.Get(ctx, key, pod))
	pod.Status.Phase = corev1.PodRunning
	pod.Status.ContainerStatuses = []corev1.ContainerStatus{{
		Name:  v1alpha1.EphemeralRunnerContainerName,
		State: corev1.ContainerState{Running: &corev1.ContainerStateRunning{}},
	}}
	require.NoError(t, c.Status().Update(ctx, pod))

	_, err = newReconciler().Reconcile(ctx, ctrl.Request{NamespacedName: key})
	require.ErrorContains(t, err, "failed to update runner status for Phase/Reason/Message/Ready")
	assert.Equal(t, 1, podCount())
	assert.Zero(t, getRunner().Status.RunnerID)
	assert.Empty(t, getRunner().Status.RunnerName)

	_, err = newReconciler().Reconcile(ctx, ctrl.Request{NamespacedName: key})
	require.NoError(t, err)
	assert.Equal(t, 1, podCount())
	assert.Equal(t, 2, statusPatchAttempts)
	assert.Equal(t, 7, getRunner().Status.RunnerID)
	assert.Equal(t, "test-runner", getRunner().Status.RunnerName)
}

func TestReconcileRejectsMalformedJITSecretBeforeCreatingPod(t *testing.T) {
	ctx := context.Background()
	key := types.NamespacedName{Namespace: "default", Name: "test-runner"}

	scheme := runtime.NewScheme()
	require.NoError(t, corev1.AddToScheme(scheme))
	require.NoError(t, v1alpha1.AddToScheme(scheme))

	runner := newExampleRunner(key.Name, key.Namespace, "github-config-secret")
	runner.Finalizers = []string{ephemeralRunnerFinalizerName, ephemeralRunnerActionsFinalizerName}
	secret := &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{Name: key.Name, Namespace: key.Namespace},
		Data: map[string][]byte{
			jitTokenKey:  []byte("jit-token"),
			"runnerName": []byte(key.Name),
		},
	}
	c := ctrlfake.NewClientBuilder().
		WithScheme(scheme).
		WithObjects(runner, secret).
		WithStatusSubresource(&v1alpha1.EphemeralRunner{}).
		Build()

	reconciler := &EphemeralRunnerReconciler{
		Client:    c,
		APIReader: c,
		Log:       logr.Discard(),
		Scheme:    scheme,
		ResourceBuilder: ResourceBuilder{
			Scheme: scheme,
		},
	}

	result, err := reconciler.Reconcile(ctx, ctrl.Request{NamespacedName: key})
	require.NoError(t, err)
	assert.Equal(t, 500*time.Millisecond, result.RequeueAfter)

	err = c.Get(ctx, key, new(corev1.Pod))
	assert.True(t, kerrors.IsNotFound(err), "a malformed JIT Secret must never produce a Pod")

	err = c.Get(ctx, key, new(corev1.Secret))
	assert.True(t, kerrors.IsNotFound(err), "the malformed JIT Secret must be deleted")
}